I've never had projectile vomiting before. Not an experience I care to repeat. (Fortunately, I got to the bathroom in time.)
If I had a fever, I'd be worrying about flu, but my temp's been running normal-low the whole time -- best guess is that it's just a mild cold causing a truly horrific sinus flareup. I'm doing rather better now: taking some more Sudafed on an *empty* stomach partly cleared my head (although I'm still groggy), fixed the post-nasal drip and eased the queasiness. But it's still a slow-and-careful evening of chicken soup and toast for me, and a strong hope that this clears up tomorrow...